APA (7th ed.) Citation

Walker, N. (1991). Why punish? (1. publ.). Oxford Univ. Pr.

Chicago Style (17th ed.) Citation

Walker, Nigel. Why Punish? 1. publ. Oxford u.a: Oxford Univ. Pr, 1991.

MLA (9th ed.) Citation

Walker, Nigel. Why Punish? 1. publ. Oxford Univ. Pr, 1991.

Warning: These citations may not always be 100% accurate.